CN2041797U - Microwave heater - Google Patents
Microwave heater Download PDFInfo
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- CN2041797U CN2041797U CN 88207817 CN88207817U CN2041797U CN 2041797 U CN2041797 U CN 2041797U CN 88207817 CN88207817 CN 88207817 CN 88207817 U CN88207817 U CN 88207817U CN 2041797 U CN2041797 U CN 2041797U
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- open
- heater
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- broadening
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Abstract
The utility model provides a novel-structure microwave heater in the type of an open cavity. The open cavity is composed of a direct waveguide which is stretched by a narrow edge b and a waveguide with a trapezoidal and slow changing section which is stretched by adding the narrow edge b on the two ends; then the open cavity type heater is formed; an islands filter is connected with the back side of the open cavity body. The utility model is characterized in that both end pyramids are closed-up but not closed fully, and opened, and the open cavity body has the function of energy leaking prevention. Parts of the cavity body are openable so as to be convenient in use and operate, and the trouble can be conveniently processed. Powdery object processes can be ensured by the ventilation structure, and energy is absorbed by a dry load and used actively rather than wasted.
Description
The utility model, it is the gradual cross section of utilization waveguide theory, the open cavate heater of the microwave of design, be used for processing powder powder, graininess, bulk, sheet medium material, be used for medicine, food, chemical industry, aquatic products, textile, feed, paper class and rubber regeneration heats continuously, the usefulness of dry or sterilization, sterilization.
Because medium can instantaneously heat up in microwave field, heating, dry occasion are easy to realize serialization, automated production, obtain extensive use in national economy; Fuel factor, the field of utilization microwave cause effect and can under cryogenic conditions virus, germ be killed, and do not destroy the structure of matter and performance again, for sterilization, sterilization provide new tool.Various heaters have been designed for this reason, usefulness is the most general at present, is that the plate heater that " The Jouruol of Microwdve Power, Vol.lo; No 4 1975, P451 " provides shows as figure (1).But this equipment exists complex structure, and the port energy leaks and suppresses difficulty, can not adapt to the processing of various materials, some problems of ventilating and using.
This device is with the narrow limit of standard waveguide b broadening 4 λ, and energy is by waveguide one end feed-in, and the other end belongs to waveguide type row ripple heater then as the material outlet port.The outlet port is actually the primary antenna radiator, whole energy emissions can be gone out when not adding material, also dump energy is all radiate when adding material.Microwave energy radiation space around is not only waste on the energy, and strong energy is harmful to human body, can be one of microwave application equipment leading indicator so leak.Therefore various countries have formulated energy leakage standard, and China's regulation can not surpass 50 μ W/cm at 3 meters of distance operating position
2Must take complicated braking measure for guaranteeing this index, usually unite several inhibition parts of utilization, set up defenses in depth, but because the port energy is very strong, spark phenomenon still occurs, manufacturer often adds graphite, cement and so on absorbing material and lays water pipe at the port wall.Especially lay water pipe, also must add a series of auxiliary equipment, and on one's body these users that all raise the price, on applying, encounter problems.
Because with Narrow Wall of Waveguide limit b broadening, internal electric intensity reduces greatly, thereby the thermal efficiency that microwave energy is transformed is very low, for addressing this problem, inside adds many reactance components, brings new problem so again: reactance component is often concentrated local energy and is caused that local material is overheated, increases the uniformity of the factors disrupt processing of catching fire, when particularly processing wide material, in fact in same cross section tangible temperature gradient appears.Because reactance component adds very difficulty of manufacturer's machine debugging, elongates the production cycle, also increase maintenance, use difficulty to the user.
This device, material is entered by standard waveguide broadside center, and central opening generally can only be opened 1/10 λ after applying frequency is determined, surpass this limit, energy just is radiated.Since the limit decision that opening is more than how much cun this device can only be used in limited occasion, as, braid, stationery, sheet material processing can not be brought into play the ability of equipment.
For can unloaded drive and the course of work in absorb dump energy, this device all has water load, water is being opened all the time in vain and is being run off, and is unallowed under current protection water resource situation, can't use not having a place of condition.
This device exists insurmountable problem in the use.Owing to seal on the structure, one, inside can not be cleared up, and contradiction is more outstanding when processing different material, and material not of the same race mixes and causes quality problems; Moreover especially heater itself sparking or other factors cause the material burning, and are in a helpless situation hopeless, at this moment eliminate naked light and often improve the speed of a motor vehicle with material transmission outside, encourage the intensity of a fire again but the speed of a motor vehicle improves, can only wait for that material burnouts, conveyer belt burns out, so conveyer belt is often changed, the user has strong complaints.
Face the problems referred to above, the utility model provides a kind of microwave open cavate heater, and it can solve port effectively and leak energy; Do not add the reactance element and improve the efficiency of heating surface; Solve the problem on using; Change energy regenerative mode and aeration structure.Adapt to various materials processing and give full play to capacity of equipment.
The purpose of this utility model is achieved in that and changes the travelling-wave type heater into resonant cavity type---open cavate heater.
Open cavate heater, by the straight wave guide of narrow limit b broadening, the gradual cross section of the ladder waveguide that both sides add narrow limit b broadening constitutes open cavity, becomes open cavate heater.Its feature is: the two ends pyramid closes up and does not close, and opens wide.Straight wave guide can be according to using power, its length merogenesis of output size decision to connect.
The ladder gradual cross section waveguide of narrow limit b broadening is that open cavate heater critical piece shows as figure (2).Just because of these parts of utilization, make the utility model become a kind of new type heater, in theory, all be different from the former on the structure.
Open, be for sealing.Traditional resonator is used metal enclosed all around, and the wave field that is energized in the chamber is run into metallic walls and is reflected, and energy is fastened in the chamber and can not leaks; In open cavity, except that the side still surrounds with metallic walls, axially need not be metal enclosed, but depend on the gradual waveguide surface of ladder of narrow limit, two ends b broadening, axially reflected, thereby, still can realize resonance to some patterns.So be called open cavity, be meant axial both ends of the surface, on geometry, open, when the gradual cross section waveguide of the ladder long enough of narrow limit b broadening, energy leaks not come out.According to the utility model of this principle design, by the cavity of single material design, although port opens wide, energy leaks not come out.As long as in waveguide back, the gradual cross section of the ladder of narrow limit broadening, take braking measure simply.For example add the archipelago wave filter, just can process various materials, the actual measurement port leaks 1/10 (microwatt) that can be easy to accomplish national standard.The cooperation of this version is of universal significance in microwave energy is used; Every continuity heater has the equipment of turnover port, all can suppress energy effectively and leak, and the technology that prevents that simple, effectively energy from leaking is provided.It promptly is that ladder is again gradual that ladder gradual cross section waveguide is designed to, and both cooperate.Rank are divided into three, and its physical dimension is according to using centre frequency, contiguous several main harmonic wave and deciding, and gradual part then requires to make a plurality of harmonic waves to terminate in the port.Structurally, both are in conjunction with the physical dimension that can shorten these parts.Its operation principle is such: when microwave transmission is arrived here, and ripple, the decay while vibrating, and terminate in the port.
The utility model is by wide a of compression waveguide; Utilize the effect of the ladder gradual cross section waveguide of narrow limit b broadening; Utilize the effect of doing load to improve the efficiency of heating surface.
How many microwave applications material unit volumes absorbs microwave energy, is the major parameter of the efficiency of heating surface height of decision heater.Unit volume absorbs energy Pa=5/9 E
2FErtg δ * 10
-10(watt/centimetre
2), after to add thermal material fixed, and applying frequency is fixed, will seek high electric field strength E.The utility model electric field strength E (E=Em/
) determine by following formula: Em
2=(480 π)/(ab).(λ g)/(λ) P(wherein a, b is respectively the broadside and the narrow limit of heater; Wavelength and free space wavelength in λ g, λ are respectively and lead; P is an applied power) the open cavate heater chamber of microwave physical dimension, when using 2450 megahertzes, do not adopt traditional BJ-22 waveguide, and adopt ∏ H-26 waveguide, only this improves 1.3 times of electric-field intensity, and the efficiency of heating surface improves 1.7 times.
Any type of heater, because load is very heavy, energy is in fact very strong in energy regenerative mouth certain limit, away from the energy regenerative mouth, energy weakens gradually, can not make full use of.The utility model utilizes the ladder gradual cross section waveguide of leptoprosopy b broadening that terminal electric-field intensity is improved original 5-10 doubly.
As everyone knows, in the microwave energy application project, usually enough significantly improve the efficiency of heating surface by means of outside small amount of thermal wind energy, the dried load of the utility model design, the heat of the dump energy development of evil in febrile disease improves the efficiency of heating surface in the heat that the unloaded all energy of absorption change and the course of work.Use is done load and also brought other benefit: the heat of doing load on the one hand improves the temperature of heater itself, when steam contacts like this, reduces the chance of dewfall.Avoid because of water droplet causes the material hot-spot, in addition burning, the stability of increase whole system.Abandon on the one hand running water, conserve water resource and be the auxiliary equipment of its service can be used the local small towns, the commune and brigade run enterprise that do not possess these conditions.
The utility model structure upper part can be opened, and shows as figure (3).For practicality is provided convenience.When processing materials is changed, heater partly can be opened, clear up.In process, abnormal problem appears, where appears at, with regard to where opening, accurately promptly fix a breakdown.Can open part and heater matrix bond portion, be designed to electrically contact formula, can not inject mechanical wear takes place, and cause that electrical quantity changes and the leakage energy because of frequently opening.
The open cavate heater of microwave, the T-shape joint style is adopted in the energy feed-in, and material is passed in and out by heater port, and the physical dimension of port is not subjected to 1/10 lambda binding.After the material to be machined physical dimension is determined, determine the physical dimension of port and corresponding archipelago filter attenuation amount to control the leakage energy again.
The aeration structure design is as the utility model part, because ventilate is a thorny problem in the microwave energy application project, contradiction is more outstanding when particularly processing powder material, because this problem can not solve and make left alone without help of whole engineering, the idleness of equipment, waste a huge sum of money, the open cavate heater of microwave has solved this problem.For enlarging the equipment range of application, give full play to capacity of equipment and play an important role.Aeration structure is made up of groove and hole, and groove is distributed in both sides, and Kong Ze is distributed in both sides and above the ladder gradual cross section waveguide.It and corresponding ventilating system interact to reach and give the phase purpose.
The utility model utilizes the straight wave guide of the narrow limit of original equipment b broadening, and the gradual cross section of the ladder waveguide that two ends add narrow limit b broadening constitutes open cavity, becomes open cavity type heater.Its cavity itself has possessed the function that suppresses the energy leakage.Need not take any braking measure energy not leaked.In order to process various materials in the cavity back, connect the archipelago wave filter, can accomplish low leakage energy.Thereby, it simple in structure.It improves the efficiency of heating surface is not the original paper that is conceived to increase specific function, but the structure of utilization itself is convenient to produce.Energy regenerative adopts the T-shape joint, has enlarged the object handling capacity, and the aeration structure of design has enlarged the material range of work; Open structural part, has solved the use problem.
The utility model concrete structure is provided by following embodiment and accompanying drawing.Figure (4) is the open cavate heater configuration of the microwave figure that provides according to the utility model.
Below in conjunction with figure (4), describe open cavate heater details of concrete microwave and working condition that the utility model provides in detail.
The open cavate heater of microwave is formed open cavity by the straight wave guide (2) of narrow limit b broadening and the ladder gradual cross section waveguide (1) of narrow limit b broadening, the length of straight wave guide can be according to the power that uses and the size of output, merogenesis is coupled to each other, the every joint of cavity is provided with can open part (4), both sides hole (5) and groove (6) the composition aeration structure that distributing; Be energy regenerative T-shape joint above, be to do load (7) below the gradual change impedance matching box (3), the cavity two ends connect, archipelago wave filter (8) is a unit with certain power microwave source, the open cavate heater of identical geometrical length, can be concatenated into powerful production line, satisfy the requirement of user's output.
The open cavity that microwave energy is made up of (2) and (1) through "T"-shaped joint gradual change impedance matching box (3) feed-in carries out energy exchange, conveyer belt (not drawing among the figure) loading material enters in the chamber along the direction of arrow, absorb microwave energy among the advanced person and change into heat, steam through the hole (5) and groove (6) and the ventilating system (not drawing among the figure) that connects thereof discharge, make dry materials, dehydration; When anomaly appears in process, turn off microwave source and draw back (4) and handle; Before driving or processing the left alone without help car of a kind of material, equipment is in Light Condition in the short time, and energy is changed into heat and utilized once more by all absorptions of dried load (7); The dump energy some of processing overall process is absorbed by dried load (7), and some is transferred to the ladder gradual cross section waveguide of narrow limit b broadening, and electric-field intensity is improved 5-10 extraordinarily to utilize; Change the less energy of leaking owing to the change of medium causes the intracavity wavelength degree, the archipelago wave filter (8) that enters near cavity is suppressed.
Claims (7)
1, the open cavate heater of microwave, by narrow limit b broadening straight wave guide (2) and narrow limit b broadening ladder gradual cross section waveguide (1) constitute open cavity and become open cavate heater, straight ripple is according to using power, its length merogenesis of output size decision to connect, every joint is provided with can open part (4), and the both sides branch has hole (5) and groove (6) to form aeration structure; It is characterised in that two ends pyramid closing in and does not close that open wide, the cavity part can be opened; Energy regenerative T-shape joint gradual change impedance matching box (3) is housed above cavity one end, dried load (7) cavity two ends is housed below the end connects archipelago wave filter (8).
2, the open cavate heater of microwave according to claim 1, it by narrow limit b broadening straight ripple (2) and narrow limit broadening ladder gradual cross section waveguide (1) constitute open cavity, it is characterised in that two ends pyramid closing in and does not close unlimited; Cavity is right after archipelago wave filter (8).
3, the open cavate heater of microwave according to claim 1, straight wave guide (2) merogenesis of narrow limit b broadening connects, and it is characterised in that every joint is provided with part and can opens (4) and cavity matrix junction surface and adopt and electrically contact.
4, the open cavate heater of microwave according to claim 1, it is characterised in that both sides distributing hole (5) and groove (6) composition aeration structure.
5, the open cavate heater of microwave according to claim 1 is characterized in that below the end dried load (7) being housed.
6, the open cavate heater of microwave according to claim 1, narrow limit b broadening ladder gradual cross section waveguide (1) it is characterized in that ladder is gradual.
7, according to claim 1,6 described open cavate heaters, narrow limit b broadening ladder gradual cross section waveguide (1), it is characterized in that the gradual pyramid of ladder closes up, hole (3) is distributing above it.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 88207817 CN2041797U (en) | 1988-07-05 | 1988-07-05 | Microwave heater |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 88207817 CN2041797U (en) | 1988-07-05 | 1988-07-05 | Microwave heater |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2041797U true CN2041797U (en) | 1989-07-26 |
Family
ID=4841779
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 88207817 Withdrawn CN2041797U (en) | 1988-07-05 | 1988-07-05 | Microwave heater |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2041797U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1061508C (en) * | 1996-10-18 | 2001-01-31 | 蔡同福 | Means for preventing microwave leakage for transmission equipment |
| CN101495830B (en) * | 2006-07-31 | 2011-01-12 | 大金工业株式会社 | Water repellent powder drying method, production process and production apparatus |
-
1988
- 1988-07-05 CN CN 88207817 patent/CN2041797U/en not_active Withdrawn
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1061508C (en) * | 1996-10-18 | 2001-01-31 | 蔡同福 | Means for preventing microwave leakage for transmission equipment |
| CN101495830B (en) * | 2006-07-31 | 2011-01-12 | 大金工业株式会社 | Water repellent powder drying method, production process and production apparatus |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |